﻿using VNStories.Data;

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;
using Windows.UI.Xaml.Data;
using Windows.UI.Xaml.Input;
using Windows.UI.Xaml.Media;
using Windows.UI.Xaml.Navigation;
using Windows.ApplicationModel.DataTransfer;
using System.Text;
using Windows.Storage.Streams;


// The Item Detail Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234232

namespace VNStories
{
    /// <summary>
    /// A page that displays details for a single item within a group while allowing gestures to
    /// flip through other items belonging to the same group.
    /// </summary>
    public sealed partial class ItemDetailPage : VNStories.Common.LayoutAwarePage
    {

        private static TypedEventHandler<DataTransferManager, DataRequestedEventArgs> _handler;
        private SampleDataItem _item; // Recipe currently displayed


        public ItemDetailPage()
        {
            this.InitializeComponent();
            
        }

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            try
            {
                var item = App.DataSource.GetItem((String)e.Parameter);
                this.DefaultViewModel["Group"] = item.Group;
                this.DefaultViewModel["Items"] = item.Group.Items;
                this.flipView.SelectedItem = item;
                this._item = item;

                // Register handler for DataRequested events for sharing
                if (_handler != null)
                    DataTransferManager.GetForCurrentView().DataRequested -= _handler;

                _handler = new TypedEventHandler<DataTransferManager, DataRequestedEventArgs>(OnDataRequested);
                DataTransferManager.GetForCurrentView().DataRequested += _handler;
            }
            catch
            {
                this.Frame.Navigate(typeof(GroupedItemsPage));
            }
            

            base.OnNavigatedTo(e);
        }

        void OnDataRequested(DataTransferManager sender, DataRequestedEventArgs args)
        {
            var request = args.Request;
            request.Data.Properties.Title = _item.Title;
            request.Data.Properties.Description = "Story";

            // Share recipe text
            StringBuilder builder = new StringBuilder();
            builder.Append(_item.Title +"\r\n " + "\n\n");
            builder.Append(_item.Description + "\r\n");
           builder.Append("Install VietnamStories and have fun with me ^^");

            request.Data.SetText(builder.ToString());
        }

        private void FlipView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            this._item = (sender as FlipView).SelectedItem as SampleDataItem;
        }

        /// <summary>
        /// Populates the page with content passed during navigation.  Any saved state is also
        /// provided when recreating a page from a prior session.
        /// </summary>
        /// <param name="navigationParameter">The parameter value passed to
        /// <see cref="Frame.Navigate(Type, Object)"/> when this page was initially requested.
        /// </param>
        /// <param name="pageState">A dictionary of state preserved by this page during an earlier
        /// session.  This will be null the first time a page is visited.</param>
        protected override void LoadState(Object navigationParameter, Dictionary<String, Object> pageState)
        {
            // Allow saved page state to override the initial item to display
            if (pageState != null && pageState.ContainsKey("SelectedItem"))
            {
                navigationParameter = pageState["SelectedItem"];
            }

            // TODO: Create an appropriate data model for your problem domain to replace the sample data
            var item = App.DataSource.GetItem((String)navigationParameter);
            this.DefaultViewModel["Group"] = item.Group;
            this.DefaultViewModel["Items"] = item.Group.Items;
            this.flipView.SelectedItem = item;
        }

        /// <summary>
        /// Preserves state associated with this page in case the application is suspended or the
        /// page is discarded from the navigation cache.  Values must conform to the serialization
        /// requirements of <see cref="SuspensionManager.SessionState"/>.
        /// </summary>
        /// <param name="pageState">An empty dictionary to be populated with serializable state.</param>
        protected override void SaveState(Dictionary<String, Object> pageState)
        {
            var selectedItem = (SampleDataItem)this.flipView.SelectedItem;
            pageState["SelectedItem"] = selectedItem.UniqueId;
        }
    }
}
